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2500 KVA 480/277 secondary Transformer conduit & w #177421 05/02/08 07:48 AM
Joined: Mar 2003
Posts: 849
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Yoopersup Offline OP
Member
Thur experience for Cost (Material & Labor) what have you found to be the most cost effective combination of pipe & wire??? Pvc Sch. 40 with Alum or Copper . I;m looking for 3000 amps. Another words 500 mcm , 750, 1000 copper or alum.
4 wires in a conduit. Useing 310.16 75C & 110.14c for terms.
Yoopers
Also mostly 480 volt loads so Neutral can be 12 1/2 percent of phase conductors right.

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Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: Yoopersup] #177423 05/02/08 09:19 AM
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Posts: 4,287
electure Offline
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Didn't you already ask this question back in February?

Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: electure] #177431 05/02/08 12:09 PM
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Posts: 2,148
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resqcapt19 Offline
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I'd take a look at bus duct for that size feeder.


Don(resqcapt19)
Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: resqcapt19] #177438 05/02/08 04:56 PM
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Yoopersup Offline OP
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One I posted in Feb was a bit different , Just wondering thur experience which way worked out better.never to proud to learn. Right

Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: Yoopersup] #177523 05/05/08 07:02 PM
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Posts: 1,273
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Tesla Offline
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At 3000 Amps your 'window' becomes restrictive, you'll need to stuff 400 Amps in each of eight pipes. That means that you might be forced to go with copper in schedule 40 PVC.

By comparison, bus duct can be had at 3000 Amps in AL.

The shorter path and cheaper conductor makes bus duct a serious competitor.


Tesla
Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: Tesla] #177525 05/05/08 07:59 PM
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ghost307 Offline
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Another consideration with bus duct is the difference in labor hours. Slap up 1 10' length of bus duct and you're done with 10' of feed. For 10' of conduit you still have to pull and terminate the wires...PLUS you have multiple sets of everything.


Ghost307
Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: ghost307] #177571 05/07/08 07:01 PM
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Yoopersup Offline OP
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Cost of Buss Duct custom made otta this world .

Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: Yoopersup] #177583 05/07/08 10:35 PM
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George Little Offline
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Ernie- You've left out some details (as usual) and I wonder if the question factors in the grounding conductor? With metal raceway - no ground wire- with non-metallic you will need a ground wire- since this is not service. Right? Wrong?


George Little
Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: George Little] #177590 05/08/08 06:17 AM
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resqcapt19 Offline
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How long is the total run? You have to watch out for the length difference with parallel runs.


Don(resqcapt19)
Re: 2500 KVA 480/277 secondary Transformer conduit & w [Re: resqcapt19] #177594 05/08/08 07:52 AM
Joined: Mar 2003
Posts: 849
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Yoopersup Offline OP
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George
Service conduits from utility Co, transformer to Service gear that means NO GROUND WIRE.
Total run is Aprox. 40feet and yes I know about requrements of Parrell runs.
Buss 90's if you've ever installed then cost a bundle as well as regular buss. But I agree worth a price compaireson.

Last edited by Yoopersup; 05/08/08 07:59 AM.
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